An electric company operates a fleet of trucks that provide electrical service to the construction industry. Monthly maintenance cost has been $75 per truck. A random sample of 16 trucks provided a sample mean maintenance cost of $82.50 per month, with a sample standard deviation of $30. Using a 5% level of significance, You like to see whether the mean monthly maintenance cost has increased. Set the appropriate hypotheses and calculate the test statistic

A. Z=+1

B. t=+1

C. Z=1

D. t=1

Answer rating: 100% (QA)

H 0 75 VS H 1 75 n16 x 8250 S 30 n1... View the full answer